PowerPoint has had a 'present in Teams' button, which shows you the presenter display and everyone else the slides, for at least five years. It renders the slides on each client, so works with accessibility, supports zooming, and so on. It is big and right next to the share button.

Yet, even when I was at Microsoft, most people shared PowerPoint presentations by sharing the window. A lot don't even put it in present mode, so you're also seeing a load of UI around the slides.

I still can't quite get over this. For once, some people at MS actually did a good thing and built a really discoverable UI around it (it's a huge button! It's right there!). And still most people don't use it.